I don't think there are that many other CPU/IGPs out there at that price point. (Also I think this answers why we won't see it in regular non-BGA CPUs) Since nobody anybody but Intel, knows cost of that chip. (Or so far didn't say. Didn't see anything even from D. Kanter)

Actually, I'm quite sure it's targeted towards people who spend $2500+ on a fully-equipped MacBook Pro because adding that CPU to any other system would push it into another price level completely. I'm an EliteBook user and I have absolutely no interest in Iris since Intel's professional OpenGL support continues to be a standing joke among professionals.